In more detail
15% of 80 is 12; 18 is 25% of 72; 80 to 100 is a 25% increase, while 100 back to 80 is a 20% decrease. See the Percentage Formulas Cheat Sheet.
Glossary
Math & Statistics
Percentage
A percentage expresses a number as a part of 100, so 25% means 25 out of every 100, or one quarter.
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See also
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Glossary
Percent error
Percent error compares a measured value with the true value as a percentage: `|measured − true| / |true| × 100`.
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Glossary
Ratio
A ratio compares two quantities by division, written a:b, and is usually simplified by their greatest common factor.